other Exam Numerical Ability

The integers from I to 1000 are written in order around a circle. Starting at I, every fifteenth number is marked (that is, I, 16, 31, etc.). This process is continued until a number is reached which has already been marked. How many unmarked numbers remain?

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other Other Question

" I am eight times as old as you were when I was as old as you are " , said a man to his son. Find out their present ages if the sum of the their ages is 75 years. Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.